JP2005225145A - Liquid ejector and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize or enhance liquid ejection performance for individual ejection objects by enhancing cleaning effect of a liquid ejection nozzle without damaging the liquid ejection surface of a liquid ejection head. <P>SOLUTION: At the time of starting operation for ejecting liquid toward an ejection object, a cap member 21 is opened and the liquid ejection surface 22 is wiped by moving a cleaning member 24 while touching the liquid ejection surface 22. After moving the cleaning member 24 on the liquid ejection surface 22, a liquid drop is ejected preliminarily from a liquid ejection nozzle 23 toward the cap member 21. Subsequently, under a state where the cap member 21 retreated from the liquid ejection surface 22, a liquid drop is ejected preliminarily from the liquid ejection nozzle 23 toward a platen plate immediately before the liquid is ejected toward the ejection object. Consequently, cleaning effect of the liquid ejection nozzle 23 is enhanced and liquid ejection performance is stabilized or enhanced for individual ejection objects. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid ejection apparatus that ejects liquid droplets from a liquid ejection nozzle of a liquid ejection head to a discharge target and a control method thereof, and more specifically, preliminary ejection of liquid droplets from a liquid ejection nozzle at the start of liquid ejection operation, Furthermore, the present invention relates to a liquid ejection apparatus that stabilizes or improves the liquid ejection performance for each ejection object by preliminarily ejecting liquid droplets from the liquid ejection nozzle immediately before the liquid ejection to the ejection object, and a control method thereof. is there.

  An ink jet type image forming apparatus as an example of a liquid ejecting apparatus, for example, an ink jet printer, is widely used because of its low running cost, easy colorization of a printed image, and miniaturization of the apparatus. This ink jet printer is designed to perform image recording by ejecting a small amount of ink from a minute ink ejection nozzle provided on the ink ejection surface of a so-called serial head type print head, and continuously performing a printing operation. If the ink is not ejected from the ink ejection nozzle of the print head, the ink adhering to the vicinity of the ink ejection nozzle on the ink ejection surface due to the previous printing operation will evaporate and dry to thicken and solidify. Therefore, normal ink ejection becomes difficult.

  For this reason, conventionally, a slightly hard rubber blade or the like is pressed against the ink ejection surface of the print head and slid on the ink ejection surface to adhere to the ink ejection surface and increase the viscosity and solidify the ink. The print head was cleaned by removing (wiping). In relation to this, a technique is disclosed in which a plurality of blades are attached to a rotating shaft and rotated to further increase the wiping effect (see, for example, Patent Document 1).

In contrast to the above-described serial head type print head, there is also a so-called line head type. In this line head system, a print head having a length equivalent to that of the recording paper is provided opposite to the recording paper conveyance belt, and the print head is fixed to the holding means, and only the recording paper is fed in a certain direction. Printing can be executed. Therefore, high-speed printing is possible, and it is mainly used for business use. In order to maintain ink ejection characteristics, print heads perform preliminary ink ejection during non-printing, but some line head type print heads perform preliminary ejection on a recording paper transport belt. . At this time, the ink preliminarily ejected on the recording paper conveyance belt is subjected to a wiping operation by moving the conveyance belt by pressing a roller cleaner, a plate cleaner, or the like installed on the downstream side of the conveyance belt against the conveyance belt. Cleaning has been performed (for example, see Patent Document 2).
JP 57-34969 A JP 2000-127362 A

  However, in the technique described in the above-mentioned Patent Document 1, a slightly hard rubber blade is pressed against the ink discharge surface of the print head and slid on the ink discharge surface to adhere to the ink discharge surface. Since the ink is wiped, a large force is applied to the ink discharge surface by the blade, and the ink discharge surface may be damaged. In addition, the blade has to rely only on the wiping effect, but ink may remain in the ink discharge nozzles only by wiping. Even when a plurality of blades are used, the ink discharge surface may be damaged in the same manner as described above, and ink may remain in the vicinity of the ink discharge nozzle.

  In the technique described in Patent Document 2, in the line head type print head, when a wiping cleaning means such as a roller cleaner or a plate cleaner is provided on the most downstream side of the transport belt, the upstream ink discharge nozzles Since the ink on the transport belt by the preliminary ejection that takes time requires time from the preliminary ejection to the cleaning, the ink is dried, fixed, etc. during that time, and the preliminary ejected ink may not be wiped off. In addition, a fixing heater or the like may be provided in the recording paper conveyance area, and the predischarge ink may be fixed to the conveyance belt due to heat from the heater or the like.

  Depending on the characteristics of the ink, the drying of the ink becomes faster in a high temperature and low humidity environment such as a temperature of 35 ° C. and a humidity of 30%. For example, in the techniques described in Patent Documents 1 and 2, recording is performed. If cleaning is performed at an appropriate timing before the printing operation on the paper or in the middle of the printing operation, the ink may thicken or solidify in the middle or near the end of the actual printing on the recording paper. May occur or may adhere to the conveyor belt. In this case, the printing quality may deteriorate even during printing on one sheet of recording paper.

  Therefore, the present invention addresses such problems, does not damage the liquid discharge surface of the liquid discharge head, improves the cleaning effect of the liquid discharge nozzle, and stabilizes the liquid discharge performance for each discharge target. Another object of the present invention is to provide a liquid ejecting apparatus and a control method thereof that are improved.

  In order to achieve the above object, a liquid discharge apparatus according to a first invention includes a liquid discharge head having a liquid discharge surface provided with a liquid discharge nozzle, and a cleaning member that wipes while moving in contact with the liquid discharge surface. A cap member that houses the cleaning member and protects the liquid discharge surface of the liquid discharge head; and opens and closes the cap member to open the cap member and move the cleaning member to the liquid discharge head liquid. Cap opening / closing means for moving both of them in a direction perpendicular to the row of the liquid discharge nozzles in contact with the discharge surface, drive control means for controlling the drive of the cap opening / closing means, and the liquid A discharge control means for controlling the discharge operation of the liquid droplets from the liquid discharge nozzle on the discharge surface; and a liquid discharge head that supports the discharge target object. And a platen plate for receiving droplets ejected from the liquid ejection head, and driving the cap opening / closing means under the control of the drive control means at the start of the liquid ejection operation on the ejection object. Open the cap member, wipe the liquid discharge surface by moving the cleaning member in contact with the liquid discharge surface, and move the liquid discharge surface from the liquid discharge nozzle by the control of the discharge control means after the cleaning member moves the liquid discharge surface. Liquid droplets are preliminarily discharged to the cap member, and then the platen is moved from the liquid discharge nozzle to the platen by the control of the discharge control means immediately before the liquid discharge to the discharge target in a state where the cap member is retracted from the liquid discharge surface. The liquid droplets are preliminarily discharged to the plate.

  With such a configuration, at the start of the liquid discharge operation on the discharge target, the cap opening / closing means is driven under the control of the drive control means to open the cap member, and the cleaning member is moved in contact with the liquid discharge surface. After the liquid ejection surface is wiped and the cleaning member moves on the liquid ejection surface, liquid droplets are preliminarily ejected from the liquid ejection nozzle to the cap member under the control of the ejection control means, and then the cap member is ejected from the liquid ejection surface. In the state of being retracted, the liquid discharge nozzles preliminarily discharge liquid droplets onto the platen plate under the control of the discharge control means immediately before the liquid discharge to the discharge target. Thereby, the liquid discharge surface of the liquid discharge head is not damaged, the cleaning effect of the liquid discharge nozzle is improved, and the liquid discharge performance for each discharge target is stabilized or improved.

  According to a second aspect of the present invention, there is provided a liquid discharge apparatus including a liquid discharge head having a liquid discharge surface provided with a row of liquid discharge nozzles for each of a plurality of types of liquid, and wiping while moving in contact with the liquid discharge surface. A cleaning member, a cap member that accommodates the cleaning member inside and protects the liquid ejection surface of the liquid ejection head, and opens and closes the cap member to open the cap member to eject the cleaning member. A cap opening / closing means for moving the both in a direction orthogonal to the row of the liquid discharge nozzles for each of the plurality of types of liquids while being in contact with the liquid discharge surface of the head; and driving the cap opening / closing means. A drive control unit for controlling, a discharge control unit for controlling a droplet discharge operation from the liquid discharge nozzle on the liquid discharge surface, and the discharge target. A platen plate for defining a positional relationship with the liquid discharge head and receiving liquid droplets discharged from the liquid discharge head, and at the start of a liquid discharge operation on the discharge target, The cap opening / closing means is driven to open the cap member, and the cleaning member is brought into contact with the liquid discharge surface to be moved, thereby wiping the liquid discharge surface. In the order in which the nozzles pass through the discharge nozzle row, preliminary discharge of liquid droplets from the liquid discharge nozzle to the cap member is performed under the control of the discharge control means, and then the discharge target is discharged with the cap member retracted from the liquid discharge surface. Immediately before the liquid is discharged to the object, the liquid discharge nozzle preliminarily discharges the liquid droplets onto the platen plate under the control of the discharge control means. .

  With such a configuration, at the start of the liquid discharge operation on the discharge target, the cap opening / closing means is driven under the control of the drive control means to open the cap member, and the cleaning member is moved in contact with the liquid discharge surface. The liquid discharge surface is wiped, and the liquid droplets are discharged from the liquid discharge nozzle to the cap member by the control of the discharge control means in the order in which the cleaning member passes through the liquid discharge nozzle row for each of a plurality of types of liquid on the liquid discharge surface. Preliminary discharge, and then, with the cap member retracted from the liquid discharge surface, immediately before liquid discharge to the discharge target, the liquid discharge nozzle preliminarily drops liquid onto the platen plate under the control of the discharge control means. Discharge. As a result, even in a liquid ejecting apparatus that ejects a plurality of types of liquid onto an ejection target, the liquid ejection surface of the liquid ejection head is not damaged, and the cleaning effect of the liquid ejection nozzle is improved. Stabilize or improve the discharge performance.

Further, according to a third aspect of the present invention, there is provided a method for controlling a liquid ejection apparatus, wherein when a liquid ejection operation is started on an ejection target, the cap opening / closing means is driven to open the cap member and the cleaning member is brought into contact with the liquid ejection surface to move. Thus, the liquid discharge surface is wiped, and after the cleaning member moves on the liquid discharge surface, liquid droplets are preliminarily discharged from the liquid discharge nozzle to the cap member, and then the cap member is retracted from the liquid discharge surface. In this state, control is performed so that liquid droplets are preliminarily discharged from the liquid discharge nozzle to the platen plate immediately before liquid discharge to the discharge target.
Thereby, the liquid discharge surface of the liquid discharge head is not damaged, the cleaning effect of the liquid discharge nozzle is improved, and the liquid discharge performance for each discharge target is stabilized or improved.

Furthermore, according to a fourth aspect of the present invention, there is provided a method for controlling a liquid ejection apparatus, wherein when a liquid ejection operation is started on an ejection target, the cap opening / closing means is driven to open the cap member, and the cleaning member is brought into contact with the liquid ejection surface. The liquid discharge surface is wiped, and the liquid discharge nozzle reserves droplets from the liquid discharge nozzle to the cap member in the order that the cleaning member passes through the liquid discharge nozzle row for each of a plurality of types of liquid on the liquid discharge surface. Control is performed so that droplets are preliminarily discharged from the liquid discharge nozzle to the platen plate immediately before liquid discharge to the discharge target in a state where the cap member is retracted from the liquid discharge surface. It is.
As a result, even in the control method of the liquid discharge apparatus that discharges a plurality of types of liquids onto the discharge target, the liquid discharge surface of the liquid discharge head is not damaged and the cleaning effect of the liquid discharge nozzle is improved, and the individual discharge target Stabilize or improve the liquid ejection performance for objects.

  According to the liquid discharge apparatus of the first aspect, the liquid discharge surface of the liquid discharge head is not damaged, and the cleaning effect of the liquid discharge nozzle can be improved. In addition, at the start of the liquid discharge operation on the discharge target, a liquid droplet is preliminarily discharged from the liquid discharge nozzle to the cap member, and then again from the liquid discharge nozzle to the platen plate immediately before the liquid discharge to the discharge target. By pre-discharging the liquid droplets, the liquid discharge performance for individual discharge objects can be stabilized or improved by adjusting the meniscus of the liquid discharge nozzle, even for liquids that are fast to dry, thicken and solidify. Can do.

  According to the second aspect of the present invention, when droplets are discharged from the liquid discharge nozzle to a plurality of discharge objects, the cap member is connected to the liquid discharge surface for the second and subsequent discharge objects. In the retracted state, the preliminary discharge of the liquid droplets from the liquid discharge nozzle to the platen plate is repeatedly performed immediately before the liquid discharge to each discharge target object, thereby cleaning all of the second and subsequent discharge objects. Even if it is a liquid that is quickly dried, thickened, and solidified by repeating the necessary cleaning operation without repeating the operation, the liquid discharge performance for each discharge target is adjusted by adjusting the meniscus of the liquid discharge nozzle Can be stabilized or improved.

  According to a third aspect of the present invention, a waste liquid receiving portion that receives liquid droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member. The droplets preliminarily ejected from the cap member to the cap member can be received so as not to contaminate the surroundings. Further, the waste liquid can be held only for a predetermined period.

  Furthermore, according to the invention of claim 4, the platen plate is provided with a waste liquid receiving portion for receiving the liquid droplets preliminarily discharged from the liquid discharge nozzle, so that the waste liquid receiving portion can By receiving droplets preliminarily discharged onto the platen plate, the surroundings can be prevented from being soiled. Further, the waste liquid can be held only for a predetermined period.

  According to the liquid ejecting apparatus of the fifth aspect, even in the liquid ejecting apparatus that ejects a plurality of types of liquid onto the ejected object, the liquid ejecting surface of the liquid ejecting head is not damaged and the cleaning effect of the liquid ejecting nozzle is improved. Can be planned. In addition, at the start of the liquid discharge operation on the discharge target object, preliminary liquid droplets are reserved from the liquid discharge nozzle to the cap member in the order in which the cleaning member passes through the liquid discharge nozzle row for each of the plurality of types of liquid on the liquid discharge surface. Even if it is a liquid that is quick to dry, thicken, solidify by pre-discharging liquid droplets from the liquid discharge nozzle to the platen plate again immediately before discharging the liquid to the discharge target, By adjusting the meniscus of the liquid discharge nozzle, the liquid discharge performance for each discharge target can be stabilized or improved.

  According to the invention of claim 6, when droplets are discharged from the liquid discharge nozzle to a plurality of discharge objects, the cap member is connected to the liquid discharge surface for the second and subsequent discharge objects. In the retracted state, the preliminary discharge of the liquid droplets from the liquid discharge nozzle to the platen plate is repeatedly performed immediately before the liquid discharge to each discharge target object, thereby cleaning all of the second and subsequent discharge objects. Even if it is a liquid that is quickly dried, thickened, and solidified by repeating the necessary cleaning operation without repeating the operation, the liquid discharge performance for each discharge target is adjusted by adjusting the meniscus of the liquid discharge nozzle Can be stabilized or improved.

  According to the seventh aspect of the present invention, the waste liquid receiving portion for receiving the liquid droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member. The droplets preliminarily ejected from the cap member to the cap member can be received so as not to stain the surroundings. Further, the waste liquid can be held only for a predetermined period.

  According to an eighth aspect of the present invention, the platen plate is provided with a waste liquid receiving portion for receiving the liquid droplets preliminarily discharged from the liquid discharge nozzle, so that the waste liquid receiving portion can By receiving droplets preliminarily discharged onto the platen plate, the surroundings can be prevented from being soiled. Further, the waste liquid can be held only for a predetermined period.

  According to the control method for the liquid discharge apparatus according to the ninth aspect, the liquid discharge surface of the liquid discharge head is not damaged, and the cleaning effect of the liquid discharge nozzle can be improved. In addition, at the start of the liquid discharge operation on the discharge target, a liquid droplet is preliminarily discharged from the liquid discharge nozzle to the cap member, and then again from the liquid discharge nozzle to the platen plate immediately before the liquid discharge to the discharge target. By pre-discharging the liquid droplets, the liquid discharge performance for individual discharge objects can be stabilized or improved by adjusting the meniscus of the liquid discharge nozzle, even for liquids that are fast to dry, thicken and solidify. Can do.

  According to the invention of claim 10, when the liquid droplets are discharged from the liquid discharge nozzle to a plurality of discharge objects, the cap member is connected to the liquid discharge surface for the second and subsequent discharge objects. In the retracted state, the preliminary discharge of the liquid droplets from the liquid discharge nozzle to the platen plate is repeatedly performed immediately before the liquid discharge to each discharge target object, thereby cleaning all of the second and subsequent discharge objects. Even if it is a liquid that is quickly dried, thickened, and solidified by repeating the necessary cleaning operation without repeating the operation, the liquid discharge performance for each discharge target is adjusted by adjusting the meniscus of the liquid discharge nozzle Can be stabilized or improved.

  According to the eleventh aspect of the present invention, the waste liquid receiving portion that receives the liquid droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member. The droplets preliminarily discharged from the discharge nozzle to the cap member can be received so that the surroundings are not soiled. Further, the waste liquid can be held only for a predetermined period.

  Furthermore, according to the twelfth aspect of the present invention, since the platen plate is provided with a waste liquid receiving portion that receives the liquid droplets preliminarily discharged from the liquid discharge nozzle, the liquid discharge portion receives the liquid discharge portion. The droplets preliminarily discharged from the nozzle to the platen plate can be received so that the surroundings are not soiled. Further, the waste liquid can be held only for a predetermined period.

  According to the method for controlling a liquid ejection apparatus according to claim 13, even in a liquid ejection apparatus that ejects a plurality of types of liquid onto an ejection target, the liquid ejection surface of the liquid ejection head is not damaged, and the liquid ejection nozzle is cleaned. Can be improved. In addition, at the start of the liquid discharge operation on the discharge target object, preliminary liquid droplets are reserved from the liquid discharge nozzle to the cap member in the order in which the cleaning member passes through the liquid discharge nozzle row for each of the plurality of types of liquid on the liquid discharge surface. Even if it is a liquid that is quick to dry, thicken, solidify by pre-discharging liquid droplets from the liquid discharge nozzle to the platen plate again immediately before discharging the liquid to the discharge target, By adjusting the meniscus of the liquid discharge nozzle, the liquid discharge performance for each discharge target can be stabilized or improved.

  According to the fourteenth aspect of the present invention, when droplets are discharged from the liquid discharge nozzle to a plurality of discharge objects, the cap member is connected to the liquid discharge surface for the second and subsequent discharge objects. In the retracted state, the preliminary discharge of the liquid droplets from the liquid discharge nozzle to the platen plate is repeatedly performed immediately before the liquid discharge to each discharge target object, thereby cleaning all of the second and subsequent discharge objects. Even if it is a liquid that is quickly dried, thickened, and solidified by repeating the necessary cleaning operation without repeating the operation, the liquid discharge performance for each discharge target is adjusted by adjusting the meniscus of the liquid discharge nozzle Can be stabilized or improved.

  According to the fifteenth aspect of the present invention, the waste liquid receiving portion for receiving the liquid droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member. The droplets preliminarily discharged from the discharge nozzle to the cap member can be received so that the surroundings are not soiled. Further, the waste liquid can be held only for a predetermined period.

  Furthermore, according to the invention of claim 16, the platen plate is provided with a waste liquid receiving portion for receiving the liquid droplets preliminarily discharged from the liquid discharge nozzle. The droplets preliminarily discharged from the nozzle to the platen plate can be received so that the surroundings are not soiled. Further, the waste liquid can be held only for a predetermined period.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing an embodiment of an ink jet printer as an example of a liquid ejection apparatus according to the present invention. This ink jet printer 11 forms an image by ejecting ink droplets (predetermined liquid) onto a predetermined position of a recording paper (ejection target), and includes a printer main body 12 and a head cartridge 13 (see FIG. 2). And a recording paper tray 14.

  The printer main body 12 includes a transport mechanism for transporting the recording paper stored in the recording paper tray 14 and an electric circuit section for appropriately performing printing on the recording paper as an ejection target. The recording paper tray 14 is detachably attached to a tray insertion opening 15 provided at the lower front of the storage. The tray insertion port 15 also serves as a recording paper discharge port, and the recording paper printed in the printer main body 12 is discharged onto a discharge receiving portion 14 a on the upper surface of the recording paper tray 14. It is like that. In addition, a display panel 16 that displays the state of the entire operation of the ink jet printer 11 is provided at the upper front of the printer main body 12.

  Further, an upper lid 17 disposed so as to be openable and closable is attached to the upper surface side of the printer main body portion 12. When the upper lid 17 is opened, a head is disposed on the upper surface side of the printer main body portion 12 as shown in FIG. A storage portion 18 for storing the cartridge 13 is formed. In the storage portion 18, the head cartridge 13 is stored as indicated by an arrow Z and is held in a detachable state. The head cartridge 13 includes a print head 20 having an ink tank 19 for each of four colors of ink (a plurality of types of liquid) of yellow Y, magenta M, cyan C, and black K, and is mounted on the lower surface side of the print head 20. The head cap 21 is made up of. The print head 20 is called a full-line type, and an ink discharge nozzle array is arranged on the ink discharge surface on the lower surface of the print head 20 so as to correspond to the entire width of the recording paper (for example, A4 size). An image having a necessary width is formed by ejecting ink onto the recording paper while being fixed in the portion 18.

  FIG. 3 is a partially sectional side view showing the configuration of the head cartridge 13. The ink tank 19 is a liquid container in which ink is stored. The four tanks 19y, 19m, 19c, and 19k are detachably set corresponding to the four colors Y, M, C, and K. Has been. The print head 20 is a liquid discharge head that receives ink supplied from the ink tanks 19y, 19m, 19c, and 19k and discharges the ink. The ink discharge surface (liquid discharge surface) 22 on the lower surface of the print head 20 has Y. , M, C, and K ink discharge nozzles (liquid discharge nozzles) 23 are formed.

  A head cap 21 is mounted on the lower surface side of the print head 20 so as to move relative to the print head 20 and be detachable. The head cap 21 protects the ink discharge surface 22 of the print head 20 and is formed in, for example, a long and narrow box shape having rising pieces on the four sides, and thickened and adhered to the inside while moving the ink discharge surface 22. A cleaning roller (cleaning member) 24 for wiping the ink residue, a scraper 26 for scraping off the ink residue attached to the outer peripheral surface of the cleaning roller 24, and a waste liquid receiving portion 25 for receiving the ink preliminarily discharged from the ink discharge nozzle 23. have. The head cap 21 is moved by a moving means such as a motor as indicated by arrows A and B in a direction orthogonal to the longitudinal direction of the ink ejection surface 22 of the print head 20, and is printed in a state where the head cap 21 is moved in the arrow A direction. It is removed from the head 20 and is attached to the print head 20 again in a state of returning to the arrow B direction. The head cap 21 is made of hard resin or the like.

  The cleaning roller 24 wipes while moving in contact with the ink discharge surface 22 of the print head 20, and is formed in a cylindrical shape with a material such as sponge having elasticity and hygroscopicity. The head cap 21 is attached to one side of the head cap 21 in the longitudinal direction. Accordingly, it is parallel to the longitudinal direction of the ink discharge surface 22 of the print head 20. The cleaning roller 24 moves together with the head cap 21 to clean the ink discharge surface 22 of the print head 20.

  The waste liquid receiver 25 provided inside the head cap 21 receives ink droplets preliminarily ejected from the ink ejection nozzles 23 of the print head 20, and is made of a hygroscopic member such as a sponge. Thus, ink droplets preliminarily ejected from a part or the whole of the bottom surface of the head cap 21 are received. This prevents the ink preliminarily ejected from the ink ejection nozzle 23 from rebounding and absorbs the ink so that it does not accumulate on the bottom surface of the head cap 21. Accordingly, it is possible to prevent the preliminary ejection ink from rebounding at the waste liquid receiving portion 25 and reattaching to the ink ejection surface 22. In addition, the ink ejecting member that has absorbed the pre-ejected ink is removed from the waste liquid receiving unit 25 and discarded after being used for an appropriate period, and a new ink absorbing member is laid to easily clean the pre-ejected ink. be able to.

  Next, the moving structure of the head cap 21 will be described with reference to FIGS. 4 is an explanatory view showing the internal structure of the printer main body 12 shown in FIG. 2 with the outer cover removed, and FIG. 5 is an explanatory view showing the head cap opening / closing mechanism. In FIG. 4, after the head cartridge 13 is lowered in the arrow Z direction with respect to the printer main body 12 and stored in the storage portion 18, the head attaching / detaching mechanism 27 is tilted about 90 degrees forward to move the head cartridge 13 to the printer main body 12. Secure to. At this time, the head cap 21 shown in FIG. 4 is adapted to engage with the head cap opening / closing mechanism 28.

  FIG. 5 is a side view showing details of the head cap opening / closing mechanism 28 shown in FIG. First, the head cap 21 to which the cleaning roller 24 shown in FIG. 3 is attached is connected to and supported by a moving rack plate 40 in which a linear rack 29 is formed on the lower side as shown in FIG. The moving rack plate 40 moves the head cap 21 in the directions of arrows A and B. Two guide pins 41a and 41b provided at both upper ends of the inner side surface of the moving rack plate 40 are connected to a printer. The rack 29 formed on the lower side is engaged with the linear movement guide groove 43 formed on one outer plate 42 of the main body 12, and the movement motor 44 attached to the one outer plate 42 is connected to the rack 29. The pinion 30 rotated by the worm gear 45 on the rotating shaft is engaged with and supported.

  Further, two cap guide pins 46a and 46b are provided on one outer surface of the head cap 21 so as to project toward the moving rack plate 40 side. In addition, two cap guide grooves 47 and 48 that are curved into a predetermined shape are formed in an intermediate portion of one outer plate 42 of the printer main body 12 to form a movement locus of the head cap 21. The two front and rear cap guide pins 46a and 46b of the head cap 21 are respectively engaged with the cap guide grooves 47 and 48 of the outer plate 42 of the printer main body 12, and only the front cap guide pin 46a is the above-mentioned. The front end of the moving rack plate 40 is engaged with a guide groove 49 formed in a vertically long shape.

  With such a mechanism, the pinion 30 rotates in the directions of arrows C and D via the worm gear 45 by driving the moving motor 44, and the rack plate 40 for movement moves in the directions of arrows A and B by the rack 29 meshing with the pinion 30. To do. At this time, since the cap guide pin 46a at the front portion of the head cap 21 is engaged with the guide groove 49 at the front end portion of the moving rack plate 40, the head cap 21 together with the moving rack plate 40 has arrows A and B. Move in the direction. The movement trajectory of the head cap 21 at that time is determined by the shape of the cap guide grooves 47 and 48 with which the front and rear cap guide pins 46a and 46b are engaged.

  FIG. 6 is a cross-sectional view showing a specific example of the internal structure of the ink jet printer 11, and shows a stopped state before the head cartridge 13 starts its operation. FIG. 7 shows a state in which the head cap 21 that hermetically protects the ink ejection surface 22 of the print head 20 is retracted to the cap retracted position, and the printing operation is possible. As shown in FIG. 6, the ink jet printer 11 is provided with a roller at the top of the front end in the insertion direction of the recording paper tray 14 attached to the tray insertion opening 15 provided at the lower front of the printer main body 12. A paper unit 50 is provided so that the recording paper 51 stored in the recording paper tray 14 can be supplied at any time. Further, a separating means 52 comprising two rollers facing each other is provided in the supply direction of the recording paper 51 so that the recording paper 51 stored in an overlapping manner can be separated and fed one by one. . Further, a reversing roller 53 for reversing the conveyance direction of the recording paper 51 is provided in the upper part of the printer main body 12 in front of the conveyance direction of the recording paper 51 separated by the separating means 52.

  A belt conveying means 54 and a platen plate 61 described later are provided in front of the conveying direction of the recording paper 51 reversed by the reversing roller 53, and as shown in FIG. The leading end portion 55 of the belt conveying means 54 is lowered in the direction of the arrow H, and a large gap is formed between the lower surface of the print head 20. Further, in the printing operation state shown in FIG. 7, the leading end portion 55 of the belt conveying means 54 is raised in the direction of arrow I to be in a horizontal state, and a recording paper path having a predetermined small gap between the lower surface of the print head 20. To be formed.

  In the printing stop state, as shown in FIG. 6, the lower surface of the print head 20 is closed by a head cap 21 to prevent the ink from the ink discharge nozzles 23 from being dried and clogged. Further, the cleaning roller 24 provided on the head cap 21 cleans the ink discharge nozzles 23 in accordance with the operation of the head cap 21 retracting to a predetermined cap retracting position (see FIG. 7) before starting the printing operation. It has become.

  As shown in FIG. 8, the ink jet printer 11 configured as described above includes a mechanism that opens the printer main body 12 during maintenance, and has a structure that can cope with a paper jam or the like. In the belt conveying means 54, a conveying belt 57 is looped between two main pulleys 56a and 56b, a tension roller 58 for adjusting the tension of the conveying belt 57 is arranged in the middle, and the print head A guide plate and a pinch roller 60 are arranged opposite to each other on the supply side of the recording paper 51 with respect to 20, and a crushing roller 59 is arranged on the discharge side of the recording paper 51 to constitute a predetermined conveyance path.

  A platen plate 61 is disposed on the upper surface side of the belt conveying means 54. The platen plate 61 supports the recording paper 51 to define the positional relationship with the print head 20 and receives ink droplets ejected from the print head 20, as shown in FIG. The print head 20 is formed in an elongated box shape having a width corresponding to the entire width direction of the ink discharge surface 22 of the print head 20 and having rising pieces around it, and is entirely formed of ABS resin. In addition, an overhanging portion 61a is provided on the upstream side of the platen plate 61 in the conveyance direction of the recording paper 51 so as to ensure the stability of conveyance of the recording paper 51 and to sufficiently store the ejected ink droplets. It has become. Further, as shown in FIG. 9 (c), the platen plate 61 has ribs 62 to 66 which are erected from the bottom surface portion 61b and extend in the conveying direction of the recording paper 51, as shown in FIG. 9 (a). A plurality of platen plates 61 are arranged at predetermined intervals in the width direction.

  As shown in FIG. 10, the platen plate 61 is disposed at a position facing the ink discharge surface 22 on the lower surface of the print head 20, and each ink discharge nozzle 23 (23 k, 23 c, 23 m) arranged on the ink discharge surface 22. , 23y) serves as a member that supports the recording paper 51 to which the ink droplets ejected from the rear surface adhere, and serves as an ink reservoir that receives and stores excess ink droplets ejected beyond the end of the recording paper 51. It also plays a function.

  Also, as shown in FIG. 10, the first rib 62 to the fifth rib 66 are formed from the upstream side to the downstream side in the conveyance direction of the recording paper 51, and the top surfaces of the ribs have substantially the same height. The recording paper 51 and the ink ejection surface 22 are supported by supporting the back surface of the recording paper 51 with the rib top surface outside the area where the ink droplets ejected from the ink ejection nozzles 23 of the ink ejection surface 22 adhere. In the region where the ink droplets ejected from the respective ink ejection nozzles 23 are deposited, the rib itself is missing and formed.

  Further, a waste liquid receiving portion is formed by the concave shape of the bottom surface portion 61b of the platen plate 61 shown in FIG. In addition, an ink absorbing material 67 is provided in a region where the ink droplets ejected from the respective ink ejection nozzles 23 of the ink ejection surface 22 adhere within the waste liquid receiving portion. The ink absorbing material 67 is a liquid absorbing material that absorbs ink droplets ejected from the ink ejection nozzle 23, and is made of a sponge or the like. For example, when performing borderless printing, the peripheral edge portion of the recording paper 51 is used. Ink droplets ejected beyond the range are absorbed. Thereby, the splash and splash of the ink droplets ejected vigorously from each ink ejection nozzle 23 can be reduced, which helps to prevent the back surface of the recording paper 51 from being stained. Further, by providing the ink absorbing material 67, it is possible to prevent the ink liquid from spilling due to vibration even if the ink liquid is accumulated to some extent.

  A drain ink tube 68 is attached to the bottom surface portion 61 b of the platen plate 61, and the ink preliminarily ejected from the ink ejection nozzle 23 and absorbed by the ink absorbing material 67 passes from the waste ink tube 68 to the outside of the platen plate 61. It is configured to flow out. Thereby, even if a large amount of ink is ejected, the platen plate 61 can be prevented from overflowing, and the ribs 62 to 66 can be prevented from being soiled with ink. The ink discharged from the discharged ink tube 68 is accumulated in a discharged ink tank (not shown). The platen plate 61 can be removed to improve maintainability, and can be easily removed and removed when it becomes dirty with ink.

  FIG. 11 is a block diagram for explaining the configuration and operation of the control unit 70 that controls the ink jet printer 11 configured as described above. The control unit 70 controls driving of a moving unit that moves the head cap 21 that houses the cleaning roller 24, and controls ink ejection from the ink ejection nozzles 23 of the print head 20. The control unit 71, the mechanical drive unit 72, and the head drive unit 73 are provided.

  The control unit 71 serves as a drive control unit that controls the driving of a cap opening / closing motor 76 (described later) that opens and closes the head cap 21 and an ejection control unit that controls the ejection operation of ink from the ink ejection nozzle 23. Inside, there are a ROM 74 for storing various information and control programs, and a CPU 75 for sending various control commands based on the control program read from the ROM 74, and a mechanical drive unit 72 and a head drive unit 73 described later. It is supposed to govern the control of.

  The mechanical drive unit 72 drives a cap opening / closing motor 76 for opening and closing the head cap 21 and a paper supply / discharge motor 77 for supplying and discharging the recording paper 51. The cap opening / closing motor 76 serves as a moving unit that relatively moves the outer peripheral surface of the cleaning roller 24 and the ink discharge surface 22 of the print head 20 in contact with each other. The rotation shaft of the paper supply / discharge motor 77 is provided with a rotation detection means 82 comprising an encoder for detecting the rotation angle of the print paper 51. 20 is detected, and a detection signal is sent to the control unit 71.

  Furthermore, the head driving unit 73 drives an element unit that ejects ink from the ink ejection nozzles 23 of the respective colors provided on the ink ejection surface 22 of the print head 20. Drive signals are sent to the electrothermal converting means 78, the magenta electrothermal converting means 79, the cyan electrothermal converting means 80, and the black electrothermal converting means 81, respectively.

  In the control device 70 configured as described above, the control unit 71 captures a print signal indicating an image forming operation from the outside, and positions corresponding to the ink ejection surfaces 22 of the respective colors of the print head 20 shown in FIG. A detection signal from the photoelectric switch 83 to be detected is input, a drive signal is sent to the mechanical drive unit 72 and the head drive unit 73, and the row of the ink discharge nozzles 23 of the color that the cleaning roller 24 has passed on the ink discharge surface 22. In order, the ink is preliminarily ejected into the head cap 21 in the order of yellow Y, magenta M, cyan C, and black K.

  FIG. 12 is a flowchart showing a control method of the ink jet printer 11 configured as described above, and mainly shows control of the printing operation. This control is executed according to an instruction from the CPU 75 based on a control program stored in the ROM 74 in the control unit 71 shown in FIG.

  First, when a print signal indicating the start of image forming operation is input to the control unit 71 shown in FIG. 11 in step S1 in FIG. 12, the control unit 71 sends a cap opening trigger signal to the mechanical drive unit 72 in step S2. And the cap opening / closing motor 76 is driven to start the opening operation of the head cap 21. Next, in step S3, the cleaning roller 24 wipes and cleans the ink ejection surface 22 in accordance with the opening operation of the head cap 21, and the control unit 71 sends a preliminary ejection signal to the head driving unit 73. Preliminary ink discharge is performed on the head cap 21.

  Subsequently, in step S4, it is confirmed that the head cap 21 has reached the retracted position, and in step S5, a printing operation is started. At this time, in step S6, ink is preliminarily ejected to the platen plate 61 immediately before ink ejection for actually printing on the recording paper 51. As a result, the ink discharge nozzle 23 is preliminarily discharged from the ink discharge nozzle 23 to the platen plate 61 again, so that even if the ink is fast to dry, thicken and solidify, the meniscus of the ink discharge nozzle 23 is To stabilize or improve the ink ejection performance. In this state, image forming printing is started on the recording paper 51 based on the print signal (step S7).

  Then, in step S8, it is determined whether or not the printing operation is finished. When the printing operation is finished with printing on one recording paper 51, the process proceeds to “YES”. Thereby, the control unit 71 closes the head cap 21 by sending a cap closing trigger signal to the mechanical driving unit 72 and driving the cap opening / closing motor 76 (step S9). Thereafter, the above operation may be repeated according to the input of the print signal.

  On the other hand, if printing is to be continued on the second and subsequent recording sheets 51, step S8 proceeds to the “NO” side and returns to step S6. Then, while the head cap 21 is in the retracted position, preliminary ink ejection is performed on the platen plate 61 immediately before ink ejection for actually printing on the next recording paper 51. Thereafter, in this state, image forming printing is started on the next recording paper 51 based on the print signal (step S7).

  Then, Steps S6 to S8 are repeated for the predetermined number of sheets, and when printing on the predetermined number of recording sheets 51 is completed, Step S8 proceeds to “YES” side. Thereby, the control unit 71 closes the head cap 21 by sending a cap closing trigger signal to the mechanical driving unit 72 and driving the cap opening / closing motor 76 (step S9).

  Next, a series of cleaning operations in the inkjet printer 11 configured as described above will be described with reference to FIG. First, in FIG. 13A, in the initial state, the head cap 21 is in a position closed with respect to the ink ejection surface 22 of the print head 20, and the four colors Y, M, C, and K of the ink ejection surface 22 are shown. The state where the ink discharge nozzle 23 is protected by the head cap 21 is shown.

  From this state, when a cap opening trigger signal is input to the printer body 12 when the printer is started or when printing is started, or in response to a user instruction, the moving motor 44 shown in FIG. 5 is driven to rotate. As shown in (b), the head cap 21 starts to move in the arrow A direction. At this time, along with the movement of the head cap 21, the cleaning roller 24 is successively driven and rotated while rubbing in a contact state with the ink discharge surface 22 in a state of being pressed against the ink discharge surface 22. Then, during this rotational movement, the ink residue thickened and solidified in the ink discharge nozzles 23 of the four colors Y, M, C, and K is wiped by the cleaning roller 24 and wiped off.

  At this time, after the ink residue is wiped off by the cleaning roller 24 using an optical or mechanical sensor (not shown), the waste liquid receiving portion 25 (see FIG. 3) of the head cap 21 detects the ink discharge nozzles 23 of the respective colors. When it is detected that the ink has reached right below, preliminary discharge of ink is sequentially performed on the waste liquid receiving unit 25 in order to prevent the ink discharge nozzle 23 from being clogged. In FIG. 13B, after the ink color of the Y ink discharge nozzle 23 is wiped off by the cleaning roller 24, the ink is applied to the waste liquid receiving portion 25 that has reached directly below the Y color ink discharge nozzle 23. A state of preliminary ejection is shown. Thereafter, the ink discharge nozzles 23 of the respective colors M, C, and K are wiped by the cleaning roller 24 to wipe off the ink residue, and then the waste liquid receiving unit 25 that has reached directly below the ink discharge nozzles 23 of that color. Ink is sequentially preliminarily ejected.

  As shown in FIG. 13C, the wiper and the preliminary ink discharge by the cleaning roller 24 are completed for all of the four color ink discharge nozzles 23 of Y, M, C, and K as described above. The head cap 21 moves fully in the direction of arrow A and also moves in the direction indicated by arrow J in FIG. 6 and is anchored at the head cap retracted position.

  In this state, as shown in FIG. 13 (d), the belt conveying means 54 and the platen plate 61 shown in FIG. 6 move up in the direction of arrow I and move to a state where the recording paper 51 can be conveyed. The head cartridge 13 can be printed. At this time, the recording paper 51 is supplied by the paper guide 84, and the leading end portion 51a comes to a position just before the print head 20 and stands by. The standby state of the leading end portion 51a of the recording paper 51 is detected by the rotation detecting means 82 of the paper supply / discharge motor shown in FIG. 11, and it is detected immediately before printing on the recording paper 51. Preliminary ink discharge is performed on the platen plate 61. Thereby, it is possible to improve the cleaning effect in the vicinity of the ink discharge nozzle 23 without damaging the ink discharge surface 22 of the print head 20. Further, even if the ink is fast to dry, thicken and solidify, the ink discharge performance for the individual recording paper 51 can be stabilized or improved by adjusting the meniscus of the ink discharge nozzle 23.

  Thereafter, as shown in FIG. 13 (e), the recording paper 51 is conveyed while being supported by the ribs 62 to 66 of the platen plate 61, and its leading end 51 a is below the ink ejection surface 22 of the print head 20. In the reached state, ink is ejected from each ink ejection nozzle 23 and printing and printing are actually performed on the recording paper 51. Here, in order to print on the recording paper 51 for the second and subsequent pages, only the steps shown in FIGS. 13D and 13E may be repeated without repeating the above steps. As a result, the ink is preliminarily ejected onto the platen plate 61 immediately before printing for each page of the recording paper 51, and then normal printing and printing are performed.

  When the printing and printing operations for a predetermined number of pages are completed, a cap closing trigger signal is input to the printer main body 12, and the belt conveying means 54 and the platen plate 61 are moved to an arrow H as shown in FIG. The moving motor 44 shown in FIG. 5 is rotated in the reverse direction, and the head cap 21 returns from the head cap retracted position to the initial state shown in FIG. In this return path, the cleaning roller 24 does not wipe the ink discharge nozzles 23 and does not perform preliminary ink discharge. This is for extending the life of the cleaning roller 24 and delaying the parts replacement time.

  When printing on the recording paper 51 is completed in this way, as shown in FIG. 7, the recording paper 51 is conveyed from the lower part of the print head 20 in the direction of the arrow M, and the tray insertion port 15 also serving as a paper discharge port. Is discharged to a discharge receiving portion 14a on the upper surface of the recording paper tray 14.

  In the above description, the cleaning member is the cleaning roller 24 formed in a cylindrical shape with a material such as sponge having elasticity and hygroscopicity. However, the present invention is not limited to this and the elasticity is not limited to this. It may be a flat blade made of a sponge having hygroscopicity, or a flat blade made of an elastic material such as rubber, or a flat plate made of rubber, etc. Any two blades may be combined.

  In the above description, the example applied to the ink jet printer provided with the full line type print head is described. However, the present invention is not limited to this, and the liquid contained in the liquid chamber of the liquid discharge head is discharged. Any device may be used as long as it is ejected as droplets from the nozzle. For example, the present invention can also be applied to an image forming apparatus such as a facsimile apparatus or a copying machine whose recording system is an inkjet system. Further, the present invention can also be applied to a piezoelectric ink jet printer. Furthermore, the present invention can also be applied to an ink jet printer provided with a serial type print head.

  In addition, the liquid discharged from the liquid discharge nozzle is not limited to ink, and other liquid discharge devices may be used as long as the liquid discharge head is driven to discharge a predetermined liquid to form a dot row or a dot. Can be applied. For example, a liquid ejecting apparatus for ejecting a DNA-containing solution onto a pallet in DNA identification or a liquid ejecting apparatus for ejecting a liquid containing conductive particles for forming a wiring pattern of a printed wiring board Can be applied.

1 is a schematic perspective view showing an embodiment of an ink jet printer as a liquid ejection apparatus according to the present invention. It is a perspective view which shows the state which opens the upper cover of the said inkjet printer, and accommodates a head cartridge in an accommodating part. It is a partial cross section side view which shows the structure of the said head cartridge. It is explanatory drawing which removes the outer cover of the printer main body part shown in FIG. 2, and shows an internal structure. It is explanatory drawing which shows the head cap opening / closing mechanism shown in FIG. It is sectional drawing which shows the internal structure of the inkjet printer shown in FIG. 1, and is a figure which shows the stop state before a head cartridge starts operation | movement. FIG. 6 is an explanatory view showing a state in which the print cap is enabled by retracting the head cap of the head cartridge to the cap retracted position. It is explanatory drawing which shows the state which opened the printer main-body part at the time of the maintenance of the said inkjet printer. It is explanatory drawing which shows embodiment of the platen board arrange | positioned at the lower surface of the head cartridge of the said inkjet printer. It is sectional drawing which shows the rib and ink absorber which were arranged on the said platen board. It is a block diagram for demonstrating a structure and operation | movement of the control apparatus part which controls the said inkjet printer. 3 is a flowchart illustrating a method for controlling an ink jet printer as a liquid ejection apparatus according to the present invention. It is explanatory drawing which shows a series of cleaning operation | movement in the said inkjet printer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Inkjet printer 12 ... Printer main-body part 13 ... Head cartridge 14 ... Recording paper tray 15 ... Tray insertion slot 16 ... Display panel 17 ... Upper cover 18 ... Storage part 19 ... Ink tank 20 ... Print head 21 ... Head cap 22 ... Ink ejection Surface 23 ... Ink discharge nozzle 24 ... Cleaning roller 25 ... Waste liquid receiving part 27 ... Head attaching / detaching mechanism 28 ... Head cap opening / closing mechanism 51 ... Recording paper 54 ... Belt conveying means 61 ... Platen plate 67 ... Ink absorbing material 71 ... Control part (drive) Control means, discharge control means)

Claims (16)

A liquid discharge apparatus that includes a liquid discharge head having a liquid discharge surface provided with a liquid discharge nozzle, and discharges droplets from the liquid discharge nozzle onto a discharge target,
A cleaning member that wipes while moving in contact with the liquid ejection surface;
A cap member that houses the cleaning member and protects the liquid ejection surface of the liquid ejection head;
With the opening and closing of the cap member and the opening of the cap member, the cleaning member is in contact with the liquid discharge surface of the liquid discharge head, and the two are relative to each other in a direction perpendicular to the row of the liquid discharge nozzles. A cap opening / closing means for moving automatically,
Drive control means for controlling the drive of the cap opening and closing means;
Discharge control means for controlling the discharge operation of liquid droplets from the liquid discharge nozzle on the liquid discharge surface;
A platen plate that supports the discharge object and defines a positional relationship with the liquid discharge head and receives liquid droplets discharged from the liquid discharge head;
At the start of the liquid discharge operation on the discharge target, the cap opening / closing means is driven under the control of the drive control means to open the cap member, and the cleaning member is brought into contact with the liquid discharge surface to move the liquid discharge surface. After wiping and the cleaning member moves on the liquid discharge surface, the liquid discharge nozzle preliminarily discharges the liquid droplets from the liquid discharge nozzle to the cap member under the control of the discharge control means.
Thereafter, in a state where the cap member is retracted from the liquid discharge surface, the liquid discharge nozzle preliminarily discharges the liquid droplets from the liquid discharge nozzle to the platen plate immediately before the liquid discharge to the discharge target. A liquid ejecting apparatus.   When droplets are ejected from the liquid ejection nozzle to a plurality of ejection objects, the second and subsequent ejection objects are applied to individual ejection objects with the cap member retracted from the liquid ejection surface. 2. The liquid discharge apparatus according to claim 1, wherein preliminary discharge of liquid droplets from the liquid discharge nozzle to the platen plate is repeatedly performed by the control of the discharge control unit immediately before the liquid discharge.   3. The liquid discharge apparatus according to claim 1, wherein a waste liquid receiving portion for receiving liquid droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member.   3. The liquid discharge apparatus according to claim 1, wherein the platen plate is provided with a waste liquid receiving portion for receiving droplets preliminarily discharged from the liquid discharge nozzle. A liquid ejection apparatus that includes a liquid ejection head having a liquid ejection surface provided with a row of liquid ejection nozzles for each of a plurality of types of liquid, and that ejects liquid droplets from the liquid ejection nozzle to an ejection target,
A cleaning member that wipes while moving in contact with the liquid ejection surface;
A cap member that houses the cleaning member and protects the liquid ejection surface of the liquid ejection head;
With the opening and closing of the cap member and the opening of the cap member, the cleaning member is in contact with the liquid discharge surface of the liquid discharge head, and the two are connected to the liquid discharge nozzle row for each of the plurality of types of liquids. A cap opening and closing means for relatively moving in a direction orthogonal to the
Drive control means for controlling the drive of the cap opening and closing means;
Discharge control means for controlling the discharge operation of liquid droplets from the liquid discharge nozzle on the liquid discharge surface;
A platen plate that supports the discharge object and defines a positional relationship with the liquid discharge head and receives liquid droplets discharged from the liquid discharge head;
At the start of the liquid discharge operation on the discharge target, the cap opening / closing means is driven under the control of the drive control means to open the cap member, and the cleaning member is brought into contact with the liquid discharge surface to move the liquid discharge surface. Wiping is performed, and droplets are preliminarily discharged from the liquid discharge nozzle to the cap member under the control of the discharge control means in the order in which the cleaning member passes through the liquid discharge nozzle row for each of a plurality of types of liquid on the liquid discharge surface. ,
Thereafter, in a state where the cap member is retracted from the liquid discharge surface, the liquid discharge nozzle preliminarily discharges the liquid droplets from the liquid discharge nozzle to the platen plate immediately before the liquid discharge to the discharge target. A liquid ejecting apparatus.   When droplets are ejected from the liquid ejection nozzle to a plurality of ejection objects, the second and subsequent ejection objects are applied to individual ejection objects with the cap member retracted from the liquid ejection surface. 6. The liquid discharge apparatus according to claim 5, wherein preliminary discharge of droplets from the liquid discharge nozzle to the platen plate is repeatedly performed by the control of the discharge control unit immediately before the liquid discharge.   The liquid discharge apparatus according to claim 5 or 6, wherein a waste liquid receiving portion for receiving droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member.   7. The liquid discharge apparatus according to claim 5, wherein the platen plate is provided with a waste liquid receiving portion for receiving droplets preliminarily discharged from the liquid discharge nozzle. A liquid discharge head having a liquid discharge surface provided with a liquid discharge nozzle, a cleaning member that wipes while moving in contact with the liquid discharge surface, a liquid discharge head of the liquid discharge head that accommodates the cleaning member therein and A cap member that protects the surface, and in a state where the cleaning member is brought into contact with the liquid ejection surface of the liquid ejection head as the cap member is opened and closed and the cap member is opened. A cap opening / closing means that moves relative to the direction perpendicular to the head, a drive control means for controlling the drive of the cap opening / closing means, and a discharge for controlling a droplet discharge operation from the liquid discharge nozzle on the liquid discharge surface. The positional relationship between the control means and the liquid discharge head is defined by supporting the discharge target, and discharged from the liquid discharge head. And a platen plate for receiving the droplets, a method of controlling a liquid ejecting apparatus for ejecting liquid droplets to the discharge object from the liquid discharge nozzle,
At the start of a liquid discharge operation on the discharge target, the cap opening / closing means is driven to open the cap member, and the cleaning member is moved in contact with the liquid discharge surface to wipe the liquid discharge surface. After moving the liquid discharge surface, preliminary discharge of droplets from the liquid discharge nozzle to the cap member,
Thereafter, control is performed so that liquid droplets are preliminarily discharged from the liquid discharge nozzle to the platen plate immediately before liquid discharge to the discharge target in a state where the cap member is retracted from the liquid discharge surface. Control method for liquid ejection device.   When droplets are ejected from the liquid ejection nozzle to a plurality of ejection objects, the second and subsequent ejection objects are applied to individual ejection objects with the cap member retracted from the liquid ejection surface. 10. The liquid ejection apparatus according to claim 9, wherein preliminary ejection of droplets from the liquid ejection nozzle to the platen plate is repeatedly performed immediately before liquid ejection.   The method for controlling a liquid ejection apparatus according to claim 9 or 10, wherein a waste liquid receiving portion for receiving droplets preliminarily ejected from the liquid ejection nozzle is provided inside the cap member.   11. The method for controlling a liquid ejection apparatus according to claim 9, wherein the platen plate is provided with a waste liquid receiving portion for receiving droplets preliminarily ejected from the liquid ejection nozzle. A liquid discharge head having a liquid discharge surface provided with a row of liquid discharge nozzles for each of a plurality of types of liquid, a cleaning member that wipes while moving in contact with the liquid discharge surface, and this cleaning member is housed inside And a cap member that protects the liquid ejection surface of the liquid ejection head, and the cleaning member in contact with the liquid ejection surface of the liquid ejection head as the cap member opens and closes to open and close the cap member. A cap opening / closing means for moving both of them in a direction orthogonal to the row of the liquid discharge nozzles for each of the plurality of types of liquids; a drive control means for controlling the drive of the cap opening / closing means; Defines the positional relationship between the discharge control means that controls the discharge operation of liquid droplets from the liquid discharge nozzle and the liquid discharge head that supports the discharge target. And a platen plate for receiving the droplets discharged from Rutotomoni liquid discharging head, a method of controlling a liquid ejecting apparatus for ejecting liquid droplets to the discharge object from the liquid discharge nozzle,
At the start of a liquid discharge operation on the discharge target, the cap opening / closing means is driven to open the cap member, and the cleaning member is moved in contact with the liquid discharge surface to wipe the liquid discharge surface. Preliminarily eject liquid droplets from the liquid ejection nozzle to the cap member in the order in which the liquid ejection nozzle passes through the row of liquid ejection nozzles for each of a plurality of types of liquid on the liquid ejection surface
Thereafter, control is performed so that liquid droplets are preliminarily discharged from the liquid discharge nozzle to the platen plate immediately before liquid discharge to the discharge target in a state where the cap member is retracted from the liquid discharge surface. Control method for liquid ejection device.   When droplets are ejected from the liquid ejection nozzle to a plurality of ejection objects, the second and subsequent ejection objects are applied to individual ejection objects with the cap member retracted from the liquid ejection surface. 14. The liquid ejection apparatus according to claim 13, wherein preliminary ejection of droplets from the liquid ejection nozzle to the platen plate is repeatedly performed immediately before liquid ejection.   15. The method of controlling a liquid discharge apparatus according to claim 13, wherein a waste liquid receiving portion for receiving droplets preliminarily discharged from the liquid discharge nozzle is provided inside the cap member. 15. The method for controlling a liquid discharge apparatus according to claim 13, wherein the platen plate is provided with a waste liquid receiving portion for receiving droplets preliminarily discharged from the liquid discharge nozzle.

Images